Techflex Dragon Sleeve Flame-Resistant Sleeving, 1/2”, Black
Quick Overview
- Techflex Dragon Sleeve, 1/2" nominal, black
- Non-flammable Dragon fiber: resists flame, sparks, weld spatter and molten splash
- Expands 5/16" to 7/8"; double wall, lightweight
- Fits -8 rubber, -10 rubber, -10 PTFE, -12 PTFE, -6 push-lock, -8 push-lock and 5/8" hard line
- Sold by the foot; not an insulator; decomposes at 842 degrees F
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$1.08
per Feet (USD)Techflex Dragon Sleeve Flame-Resistant Braided Sleeving, 1/2" Nominal, Black, Sold by the Foot
Double-wall braid of non-flammable Dragon fiber: shields hoses, wires and cables from open flame, sparks, weld spatter and molten splash.
Techflex Dragon Sleeve is a lightweight, double-wall braided sleeve made of Dragon fiber, which will not burn. Racetronix is a Techflex distributor. It protects lines from open flame, sparks, weld spatter and molten metal; the maker says the fiber keeps its strength longer, and at higher temperatures, than para-aramid fibers. Its wall is thin, so it holds little air and does not insulate much: for steady heat use FireFlex, and for radiant heat use T6 ThermaShield. This is the 1/2" size; it expands from 5/16" to 7/8". Sold by the foot.
Key features
- Non-flammable fiber: resists open flame, sparks, weld spatter and molten splash.
- Limiting oxygen index 45 to 55 (it will not keep burning in air).
- Double wall, tear resistant and lightweight.
- Expands from 5/16" to 7/8" to slide over fittings.
- The maker publishes no continuous temperature rating; the fiber decomposes at 842°F (450°C).
- Cuts with scissors. Sold by the foot.
Which size fits my hose?
This size suits: -8 rubber; -10 rubber; -10 PTFE; -12 PTFE; -6 push-lock; -8 push-lock; 5/8" hard line.
Choose the size whose expansion range covers the outside of your hose or bundle, and which will open up enough to pass over any fitting it has to slide over. The braid gets shorter as it expands, so cut it longer than the run.
Hose outside diameters are nominal values from our own hose pages. Measure your hose if in doubt.
Dragon Sleeve chart: all sizes
| Part | Nominal | Expands from | Expands to | Wall | Weight per foot |
|---|---|---|---|---|---|
| 299-DGN0.13BK | 1/8" | 1/16" (1.6 mm) | 3/16" (4.8 mm) | 0.020" | 0.0020 lb |
| 299-DGN0.25BK | 1/4" | 1/8" (3.2 mm) | 5/16" (7.9 mm) | 0.021" | 0.0042 lb |
| 299-DGN0.38BK | 3/8" | 3/16" (4.8 mm) | 9/16" (14.3 mm) | 0.022" | 0.0061 lb |
| 299-DGN0.50BK | 1/2" | 5/16" (7.9 mm) | 7/8" (22.2 mm) | 0.020" | 0.0080 lb |
| 299-DGN0.75BK | 3/4" | 3/8" (9.5 mm) | 1" (25.4 mm) | 0.021" | 0.0124 lb |
| 299-DGN1.25BK | 1-1/4" | 5/8" (15.9 mm) | 1-3/4" (44.4 mm) | 0.027" | 0.0203 lb |
| 299-DGN1.75BK | 1-3/4" | 3/4" (19.0 mm) | 2-1/8" (54.0 mm) | 0.021" | 0.0257 lb |
| 299-DGN2.00BK | 2" | 1" (25.4 mm) | 2-3/4" (69.8 mm) | 0.021" | 0.0317 lb |
All sizes are black and sold by the foot.
Equivalents: other brands' flame-resistant sleeve
Shopping for another brand? These are non-flammable braided sleeves in similar sizes, made from a different fiber, so they are near equivalents.
| Our part | Instead of (brand) | Their part number | Description | Match |
|---|---|---|---|---|
| 299-DGN0.50BK | DEI | 091475 | Protect-A-Sleeve, 1/2", by the foot | Near equivalent (different fiber) |
| 299-DGN1.25BK | DEI | 091483 | Protect-A-Sleeve, 1", by the foot | Near equivalent (different fiber) |
| 299-DGN2.00BK | DEI | 091482 | Protect-A-Sleeve, 2", by the foot | Near equivalent (different fiber) |
Other brands' names and part numbers are their owners' trademarks, listed only to help you compare. Check sizes against your application.
Specifications
| Construction | Double-wall braid of Dragon fiber |
| Nominal size | 1/2" |
| Expansion | 5/16" to 7/8" (7.9 to 22.2 mm) |
| Wall | 0.020" (0.5 mm) |
| Flammability | Flame resistant; limiting oxygen index 45 to 55 |
| Temperature | No continuous rating published; decomposes at 842°F (450°C) |
| Abrasion | Low: protect it where it rubs |
| Chemicals | Resists acids, alkalis and organic solvents; not for bleach |
| Cutting | Scissors |
| Sold as | By the foot, black |
Fitting Dragon Sleeve
- Cut the length you need with scissors, a little longer than the run.
- Push the braid along to open it and slide it over the line before the second fitting or connector goes on, or over a fitting that is within its expansion range.
- Pull it straight to tighten it down, and secure the ends with clamps or stainless ties.
- Keep it away from sharp edges and moving parts: it resists flame, not rubbing.
Which heat protection do I need?
Heat reaches a hose or wire in three ways, and each needs a different kind of protection.
- Radiant heat. A header or turbo throws heat out in every direction, like a stove element, and it reaches anything in line of sight. Reflective foil stops it best: the aluminized face bounces it back before it gets in.
- Heat soak. Hot air and nearby hot parts warm a line slowly and steadily. Insulation stops it. Braided fiberglass traps thousands of tiny pockets of still air, the same way the insulation in a house wall does, and still air carries heat very poorly. Squash the fiberglass and the air goes, and most of the insulation with it.
- Flame, sparks and splash. A burst line, a backfire or weld spatter. This needs a covering that will not burn: a silicone jacket or a non-flammable fibre.
Foil-over-fiberglass products combine the first two: the foil reflects, the fiberglass insulates. Nothing should rest against a bare header; wrap the header, shield the line, or both.
| Situation | Use | Why it works |
|---|---|---|
| The exhaust itself: headers, down pipes, turbo crossovers | Header wrap | Keeps the heat inside the pipe, so far less of it radiates onto the hoses, wiring and bodywork around it. The best fix is usually at the source. |
| A hose or harness close to a header or turbo (strong radiant heat) | T6 ThermaShield split tube or ThermaShield Convoluted | The aluminized face reflects most of the radiant heat before it gets in, and the fiberglass behind it insulates against what does get through. |
| A firewall, floor pan, fuel cell or ECU box facing the exhaust | ThermaShield Flat or ThermaShield Wrap | The same foil over fiberglass, as a sheet that sticks on or wraps around odd shapes. |
| Lines in a hot engine bay: steady heat soak, little direct radiant heat | FireFlex fire sleeve | A thick layer of fiberglass holds still air, which insulates; the silicone jacket seals out oil, fuel and splash. Leave at least 1/8" of air gap so the fiberglass is never squashed. |
| Single wires, sensor and thermocouple leads near heat | Insultherm Tru-Fit fiberglass sleeving | A thin fiberglass braid that insulates without adding bulk. |
| Plug wire boots close to the headers | Insultherm spark plug boot sleeves | Double-thick fiberglass where the boot sits closest to the pipe. |
| Flame, sparks, weld spatter or molten splash | Dragon Sleeve, or FireFlex if the line also needs insulating | Dragon fibre will not burn and shrugs off sparks, but its thin wall holds little air, so it does not insulate much. FireFlex resists splash and insulates. |
All the lines compared:
| Product | What it is | Heat it handles | Continuous rating | How it fits | Best for |
|---|---|---|---|---|---|
| Techflex FireFlex fire sleeve | Thick fiberglass braid with a silicone jacket | Direct heat, open flame, oil and fuel splash | 500°F (260°C) | Slides on before the hose ends go on | Fuel, oil, brake and clutch lines near headers or turbos |
| Techflex T6 ThermaShield split tube | Aluminized fiberglass tube, split, closes with an adhesive strip | Reflects radiant heat | 491°F (255°C) material; reflects radiant heat from a 1,400°F source at 3/8" | Wraps around: no need to remove fittings | Assembled hoses and harnesses near exhaust |
| Techflex ThermaShield Convoluted | Seamless aluminized fiberglass, flexible convoluted tube | Reflects radiant heat | Not published | Slides on | Hoses and wires that bend in several directions |
| Techflex ThermaShield Flat (full adhesive) | Flat aluminized fiberglass with a full adhesive back | Reflects radiant heat | Not published | Sticks to any clean surface | Firewalls, floor pans, fuel cells, ECU boxes |
| Techflex ThermaShield Wrap (adhesive edge) | Flat aluminized fiberglass joined along one edge by adhesive | Reflects radiant heat | Not published | Wraps around odd shapes | Connectors, sensors, short runs |
| Techflex Insultherm Tru-Fit fiberglass sleeving | Acrylic-treated braided fiberglass | Direct heat, no flame or fluid seal | 464°F (240°C) | Slides on | Individual wires, thermocouple and sensor leads |
| Techflex Insultherm spark plug boot sleeves | Double-thick fiberglass sleeves, 7-1/2" long | Direct heat at the header | 1,200°F | Slips over the boot | Plug wire boots close to headers |
| Techflex header wraps: Insultherm, Header Wrap SI, Volcano Wrap | Woven tape wrapped around the pipe | Keeps heat inside the exhaust | Fiberglass 1,200°F; silica 2,000°F; basalt 1,300°F | Wrapped with 1/4" overlap, tied at the ends | Headers, down pipes, turbo crossovers |
| Techflex Dragon Sleeve | Thin double-wall braid of non-flammable Dragon fibre | Flame, sparks, weld spatter, molten splash; not an insulator | None published; the fibre decomposes at 842°F (450°C) | Slides on; the braid expands | Lines and wires exposed to sparks or open flame |
| Techflex Weld Wrap HD | Silicone-coated silica braid with hook-and-loop closure | Weld spatter, slag, sparks; heat | 500°F (260°C) continuous; 2,000°F (1,093°C) intermittent | Wraps on with hook-and-loop | Welding leads and hoses; lines that see sparks |
Frequently asked questions
Is it rated to 1,800°F?
No. The 1,800°F figure seen elsewhere belongs to Techflex Dragon Arm, a different product. The maker publishes no continuous temperature rating for Dragon Sleeve; the fiber will not burn and decomposes at 842°F (450°C).
Dragon Sleeve or FireFlex?
Dragon Sleeve for flame, sparks and spatter where light weight matters. FireFlex when the line also needs insulating from heat soak and sealing against fluids.
Will it insulate a hose from heat?
Not much. Its thin wall holds little air. Use FireFlex for heat soak or ThermaShield for radiant heat.
Ratings are the maker's published figures.
